無線感測網路支援群組移動的資料散佈

在能源有限的感測節點組成的無線感測網路（wireless sensor networks）中，如何有效的運用能源進行資訊收集與傳輸，及延長存活時間已被認為是無線感測網路中重要的探討議題。以往的研究中，多點傳送協議（multicasting protocols）可支援移動的sinks群組的資料傳遞，但會因為移動sinks各自獨立進行位置更新而引起網路的高度擁塞，雖然Geocasting的協議可以解決個別sink位置更新所引起的問題，卻會因為flooding而過度消耗感測器節點的能量，且Geocasting協定只能專注於傳輸資料給一個固定區域的sink群組。基於以上原因，本論文主要設計一種在無線感測網路中支援移動sink群組的資料傳輸方式。我們主要提出一種傳輸架構來支援感設節點在sink群組移動時能夠順利接收感測資料，並解決Geocasting的flooding的能量高度消耗的方式，及延伸Geocasting的應用層面，使其支援移動性的sink群組，讓sink群組移動時仍可進行資料傳輸，且大幅減少能源消耗，使得無線感測網路能增加效能及延長感測網路的生命週期。

Wireless sensor networks are composed by a set of sensing nodes that have the limit energy. An important issue in wireless sensor networks is how to save energy for data collection and transmission, and prolong the network lifetime. In previous studies, multicast protocol can support data dissemination for mobile sink groups. But the location update of individual mobile sinks causes the network congestion. The geocasting protocol can solve the location update problem caused by individual sink, but the flooding of geocasting protocol consumes too much energy of sensor nodes. In addition, geocasting protocol can only disseminate data to a group that move in a fixed area. For these reasons, this paper proposes a data dissemination protocol to support mobile sink groups in wireless sensor networks. We mainly propose a framework to support sensor nodes to disseminate data to mobile sink groups. This scheme can solve the flooding problem of geocasting protocol and support the mobile sink groups to receive data when the group is moving. This approach can significantly reduce energy consumption, make wireless sensor networks to increase network performance and extend the lifetime of the sensor network.